I'm sort of in the same boat (pun intended .
It seems you have little say in how you work in the office. If you are stuck at the PC then you are the same as me.
Try to walk more when you can. Park in the furthest car parking bay away from your workplace (or walk/catch public transport). Go for a walk at lunch time. Volunteer for the maintenance and 'hands on' stuff and leave the computer work for the others (if you can).
Otherwise do your walking before or after work.
The "Seven Deadly Sins"
• Grains (wheat/rice/oats etc) . . . . . • Dairy (milk/yogurt/butter/cheese etc) . . . . .• Nightshades (peppers/tomato/eggplant etc)
• Tubers (potato/arrowroot etc) . . . • Modernly palatable (cashews/olives etc) . . . • Refined foods (salt/sugars etc )
• Legumes (soy/beans/peas etc)